Drive mechanism for polishing lathes



March 27, 1928.

' G. HAUMANN DRIVE MECHANISM FOR POLISHING LATHES 7 Filed March 1925 2 Sheets-Sheet 1 WVEVTUR: 650,965 HA (/MA/VN 8" March 27, 1928.

G. HAUMANN I DRIVE MECHANISM FOR POLISHING LATHES Filed March 2, 1925 2 Sheets-Sheet 2 ATTOR/VE).

Patented Mar. 27, 1928 UNITED S TATES 1,663,596 PATENT OFFICE.

GEOitGE HA'UMANN, 0F PAINESVILLE, oriro, ASSIGNOR r0 TEE r. A. GEIER COMPANY,

or CLEVELAND, onro, A CORPORATION OF onro.

DRIVE MECHANISM Eon romsnme LATEES.

Application filed March 2, 1925. Serial No. .12,522.

My invention relates to improvements in polishing lathes and like mechamsms, and has for its object the construction of a selfcontained power-driven mechanism hav ng, novel and effective control means, including a brake, preferably, unitary mounting of the driven member and the capacity for read ly changing the speedratio of the drlve.

These features, together with other advantageous details of construction, may well be explained in connection with a. polishing lathe embodying my improvements; the same being equipped with a double spindle arrangement connected with a-common mo tor which is bodily adjustable with respect to the driven spindles,'while the appllance is mounted-in a substantially dust-proof housing to. insure the best working conditions and safety of operation.

The motor is connected with each of said spindles by a counterweighted belt-tightener, and each spindle is equipped with an individual brake device provided with a resilient self-locking toggle. Each brake and belttightener, respectively, is connected to its corresponding member by an alternatively actuating lever for controlling the operation of its associated spindle.

These struct nial details will be set forth in connection with. the accompanying drawings, whereinr v Figure 1- is a view, partially in side elevation and partially in vertical section illustrat'ing a polishing lathe of double spindle type embpdying my improvements, and

Fig. 2 is a transverse sectional view on line 22, Fig. 1; the end housing wall being par-' tiallg broken away.

T roughout these drawings I have employed the same character of reference to in-' dicate similar parts.

Inspection of Figure 1 discloses a polishing lathe of a double spindle, self-contained type wherein two unitary spindle housings are associated with a common motor device respectively controllable by their conveniently positioned controlling levers. Each of these levers operates its own belt-tightening device and and an alternative, cushioned brake device for the spindle shaft.

Within the housing a there is mounted an electric motor 6, preferably provided with a vertical adjustment by means of securing bolts 6, within the slots at of the housing a.

the left is indicated as of smaller diameter than the one on the right merely to emphasize the adaptability for operating at different speeds, the two spindle housings are of identical unitary construction.

Referring to the sectionally shown housing a associated with the spindle upon the right, Fig. 1, it will be seen that the spindle shaft 0 is provided with ball bearings c and a pulley wheel 0 over which runs a loose belt I). The polishing disc 03, or any desired rotatable member, for that mater, is mounted at the outer end of shaft 0 for intermittent rotation by the motor. The pulley wheel 0" has an integral, laterally disposed brake cylinder 0 adapted to be engaged andrigidly held'by the brake quadrant e which is mounted at the upper end of a plunger e with an interposed rubber cushioning member 6".

The controlling lever f has an internal arm f connected with the plunger e and a link 7" extending to the external arm 9 of the belt-tightener, comprising the internal arm 9', a counterweight g and its laterally positioned pulley wheel 9 disposed in alinement with the belt 6 Thus it will be seen that the spindle shaft is controllable by the conveniently positioned'lever f which is ada ted alternatively to throw the helt-tightener into action for driving the spindle shaft and its attached polishing disc with the release of the brake, or apply the brake with a toiglelockingaction upon the release of the elttightener This locking capacity rovided for the s indle shaft is of materia advantage in c anging the polishing discs from time to time. 7

Moreover, it will be observed that the spindle housings a" are mounted removably upon the upper portion of the main housing a by means of bolts a, while a covera completely encloses the pulley wheel and brake in dust-tight relation. Such unitary spindle housing is capable of ready replacement in order to substitute one having a different speed ratio of pulley wheels, for example, or a different driven member. This is contributed to by the under-acting brake member,

so that a change of the shaft housing is very readily and quickly effected.

The sloted adjustment of the motor I) permits the ready positioning of said motor with respect to the driving belts so that the idlers of the belt-tightening mechanism will operate to the best advantage in conjunction with their respective brake devices. This motor is connected with a push button type of switch it so that the power unit is conveniently controlled by the operative. A dust-tight door '5 provided in the housing afii'ords access to the'interior thereof when necessary.

Each belt-tightener is provided with its adjustable weight g for throwing the proper tension upon the belt by means of its associated'idler or pulley wheel; said weight assisting in maintaining a toggle action for the cushioned locking brake upon the complete elevation of the associated controlling lever f.

Having now described the preferred embodiment of my invention, 1 claim as new and desire to secure by Letters Patent, the following:

1. In an appliance of the class described, the combination with a power shaft and a stationarily mounted driven shaft, of a potentially loose belt adapted operatively to connect the same, an associated belt-tightener, a brake device associated with the driven shaft, and a controlling lever connected with the belt-tightener and brake device,

comprising a self-locking toggle connection with the latter for rendering the one or the other alternatively operative, substantially as set forth.

2. In an appliance of the class described, the comblnation with a driven shaft, of means for driving the same, a brake device associated with said driven shaft, a controllin lever for the driving means, and a selfloc ng toggle connection between said lever and the brake device for alternatively actuating the same with respect to the driv ing means, substantially as set forth.

3. In an appliance of the class described, the combination with a driven shaft, of means for applying power thereto, a brake device and its actuating toggle associated with said shaft, a power controlling lever, and a cushioned connection between said lever and brake device for alternatively actuating the same with the disconnection of the power, substantially as set forth.

4. In an appliance of the class described, the combination with a driven shaft, of a motor device, a housing rotatably mounting said shaft, a belt operatively connecting the motor with the driven shaft, and vertical adjusting means provided upon the housing for effecting the relative adjustment of the notplr and driven shaft, substantially as set ort 5. In anfirpplia'nce of the class described,

the combination with a driven shaft, of its driving motor. a housing, a belt operatively connecting the motor with the driven shaft, means'for tightening and loosing said belt, and a slotted adjustable support for the motor provided upon the housing, substantially as set forth.

6. In an appliance of the class described, the combination with a housin a motor secured in the lower portion of t 6 housing, a driven shaft, a journal frame and terminal journals securely mounted in said frame and rotatably mounting said shaft; the journal frame being positioned above the motor and secured to the housing, a belt operatively connecting the driven shaft and the motor, and means for tightening and for relaxing said belt, substantially as set forth.

7. In an appliance of the class described, the combinatlon with a housing, of a motor adjustably mounted in the lower portion of said housing, a driven shaft, a journal frame and terminal journals rotatably mounting said shaft; the journal frame being remov ably secured to the housing above the. motor,

a belt operatively connectin the driven shaft and motor, and means: or ti htening and for relaxing the belt, substantia ly asset forth.

8. In an appliance of the class described, the combination with a housing, of a motor adjustably mounted in the lower portion of I/ said housing, a driven shaft mounted at the upperportion of the housing, a brake device associated therewith, a belt operatively connecting the shaft and the motor, belttightening means including an overthrowing counterweight, and an operating lever connected with said means and with the brake device for alternatively actuating the same, substantially as set forth.

9. In an appliance of the class described, the combination with a power shaft and a driven shaft, of apotentially loose belt adapted operatively to connect the same, an associated belt-tightener, including apulleywheel and an overthrowing counterweight, a brakedevice associated with the driven shaft, and acontrolling lever connected with the counterweight and brake device adapted alternatively to render 'one or the other operative, substantially as set forth.

- 10. In an appliance of the class described, the combination with a power shaft and a driven shaft, of a potentially loose belt adapted operatively to connect the same, an associated belt-tightener, a brake device, including a self-locking toggle associated with said driven shaft, a counterweight, and a controlling leverconnected with said toggle and counterweight, adapted alternatively to overthrow the latter in position to render eeann a the combination with a driven shaft, of locking toggle and asso'ciated brake, substanmeans for driving the same, a brake device tially as set forth. associated with said driven shaft, a self- In testimony whereof I do now aifix m 10 looking toggle connected' to actuate the si ature at Cleveland, Ohio, this 27th day 5 brake, an interposed resilient member, and 0 February, A. D. 1925.

a. dontrollin lever for the drivin means connected afternativ'ely to actuate e self- GEORGE HAUMANN. 

